Writing instrument



FIG. 1 is a perspective view showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a first side elevational view thereof;

FIG. 5 is a second side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line in FIG. 6 is included for the purpose of showing a portion of the writing instrument that forms no part of the claimed design. 

CLAIM The ornamental design for a writing instrument, as shown and described. 